MC68HC11KA Motorola, MC68HC11KA Datasheet - Page 18

• Manufacturer Part Number: MC68HC11KA
• Description: 8-Bit Microcontroller
• Manufacturer: Motorola

RAM[3:0] —Internal RAM Map Position
REG[3:0] —128-Byte Register Block Map Position
ROMAD — ROM/EPROM Mapping Control
Bit 6 — Not implemented
CLKX — XOUT Clock Enable
PAREN — Pull-Up Assignment Register Enable
NOSEC — Security Disable
18
MOTOROLA
Can be written only once in first 64 cycles out of reset in normal modes or at any time in special mode.
Specifies upper four bits of RAM address. At reset, RAM is mapped to $0000 along with register block.
Specifies upper four bits of register space address. At reset, registers are mapped to $0000.
CONFIG is made up of EEPROM cells and static working latches. The operation of the MCU is con-
trolled directly by these latches and not the actual EEPROM byte. When programming the CONFIG reg-
ister, the EEPROM byte is being accessed. When the CONFIG register is being read, the static latches
are being accessed.
These bits can be read at any time. The value read is the one latched into the register from the EE-
PROM cells during the last reset sequence. A new value programmed into this register cannot be read
until after a subsequent reset sequence. Unused bits always read as ones.
If SMOD = 1, CONFIG bits can be written at any time. If SMOD = 0 CONFIG bits can only be written
using the EEPROM programming sequence, and are neither readable nor active until latched via the
next reset.
In single-chip mode ROMAD is forced to one out of reset.
Always reads one
Refer to 6 Parallel Input/Output.
NOSEC is invalid unless the security mask option is specified before the MCU is manufactured. If se-
curity mask option is omitted NOSEC always reads one.
INIT —RAM and I/O Register Mapping
CONFIG —COP, ROM Mapping, EEPROM Enables
RESET:
RESET:
0 = ROM/EPROM located at $2000–$7FFF ($2000–$9FFF in MC68HC11KA2)
1 = ROM/EPROM located at $A000–$FFFF ($8000–$FFFF in MC68HC11KA2)
0 = XOUT pin disabled
1 = x clock driven out on the XOUT pin
0 = Security enabled
1 = Security disabled
ROMAD
RAM3
Bit 7
Bit 7
—
0
RAM2
—
6
1
6
0
CLKX
RAM1
—
5
5
0
PAREN
RAM0
—
4
4
0
NOSEC
REG3
—
3
3
0
NOCOP
REG2
—
2
2
0
ROMON
REG1
—
1
1
0
MC68HC11KA4TS/D
MC68HC11KA4
EEON
REG0
Bit 0
$003D
Bit 0
—
$003F
0